This Washington Post-ABC News poll was conducted by telephone September 7-9, 2012, among a random national sample of 1,002 adults, including landline and cell phone-only respondents. Results for the full sample have a margin of sampling error of 3.5 percentage points. The error margin is four points for the sample of 826 registered voters, and 4.5 points for the sample of 710 likely voters. Sampling, data collection and tabulation by Abt-SRBI of New York.